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Allow overriding MAC used by ARP

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This commit is contained in:
Joseph C. Lehner 2024-07-05 18:18:43 +02:00
parent 50bb426cce
commit 346ada7022
1 changed files with 15 additions and 1 deletions
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16
nmrp.c
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@ -309,6 +309,17 @@ static int mac_parse(const char *str, uint8_t *hwaddr)
return 0;
}
static bool mac_is_broadcast(uint8_t* hwaddr)
{
for (int i = 0; i != 6; ++i) {
if (hwaddr[i] != 0xff) {
return false;
}
}
return true;
}
struct is_valid_ip_arg
{
struct in_addr *ipaddr;
@ -583,7 +594,10 @@ int nmrp_do(struct nmrpd_args *args)
memcpy(tx.eh.ether_dhost, rx.eh.ether_shost, 6);
if (ethsock_arp_add(sock, rx.eh.ether_shost, ipaddr.s_addr, &arp_undo) != 0) {
// a manually specified MAC address (using `-m`) takes precedence over
// the NMRP response packets' MAC.
uint8_t* arp_mac = !mac_is_broadcast(dest) ? dest : rx.eh.ether_shost;
if (ethsock_arp_add(sock, arp_mac, ipaddr.s_addr, &arp_undo) != 0) {
goto out;
}